Added WS_PING event

Author: mathieucarbou

src/AsyncWebSocket.cpp

@@ -568,10 +568,11 @@ void AsyncWebSocketClient::_onData(void* pbuf, size_t plen) {
           _queueControl(WS_DISCONNECT, data, datalen);
         }
       } else if (_pinfo.opcode == WS_PING) {
+        _server->_handleEvent(this, WS_EVT_PING, NULL, NULL, 0);
         _queueControl(WS_PONG, data, datalen);
       } else if (_pinfo.opcode == WS_PONG) {
         if (datalen != AWSC_PING_PAYLOAD_LEN || memcmp(AWSC_PING_PAYLOAD, data, AWSC_PING_PAYLOAD_LEN) != 0)
-          _server->_handleEvent(this, WS_EVT_PONG, NULL, data, datalen);
+          _server->_handleEvent(this, WS_EVT_PONG, NULL, NULL, 0);
       } else if (_pinfo.opcode < WS_DISCONNECT) { // continuation or text/binary frame
         _server->_handleEvent(this, WS_EVT_DATA, (void*)&_pinfo, data, datalen);
         if (_pinfo.final)

src/AsyncWebSocket.h

@@ -104,6 +104,7 @@ typedef enum { WS_MSG_SENDING,
                WS_MSG_ERROR } AwsMessageStatus;
 typedef enum { WS_EVT_CONNECT,
                WS_EVT_DISCONNECT,
+               WS_EVT_PING,
                WS_EVT_PONG,
                WS_EVT_ERROR,
                WS_EVT_DATA } AwsEventType;